CN111679491A - Direct type backlight device - Google Patents
Direct type backlight device Download PDFInfo
- Publication number
- CN111679491A CN111679491A CN202010391481.9A CN202010391481A CN111679491A CN 111679491 A CN111679491 A CN 111679491A CN 202010391481 A CN202010391481 A CN 202010391481A CN 111679491 A CN111679491 A CN 111679491A
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- Prior art keywords
- type backlight
- direct type
- backlight device
- film
- optical film
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- 239000010408 film Substances 0.000 claims abstract description 38
- 238000009792 diffusion process Methods 0.000 claims abstract description 36
- 239000012788 optical film Substances 0.000 claims abstract description 26
- 239000002131 composite material Substances 0.000 claims abstract description 10
- 239000011159 matrix material Substances 0.000 claims abstract description 4
- 238000000149 argon plasma sintering Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 239000002096 quantum dot Substances 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a direct type backlight source module. The direct type backlight device comprises an optical film group, a composite diffusion film and LED lamps which are arranged in a matrix form from top to bottom. The composite diffusion film includes a first diffusion film and a second optical film thereunder. The second optical film and the first diffusion film form a plurality of hollow convex parts, and the LED lamp at least corresponds to one convex part. The invention provides a direct type backlight device for improving uniform light emission of a surface light source, which improves the utilization efficiency of light.
Description
Technical Field
The present disclosure relates to display devices, and particularly to a direct type backlight device.
Background
With the rapid development of display technology, people have increasingly high demands on displays, and particularly, demands on non-planar display devices such as flexible liquid crystal displays, curved liquid crystal displays, flexible liquid crystal displays, and foldable liquid crystal displays have increased. The flexible liquid crystal display panel is about to become the mainstream of the display field by virtue of its characteristics of lightness, thinness, bendability and impact resistance. However, the liquid crystal display device is a non-self-luminous display device, and the display can be realized only by matching with backlight, thereby greatly increasing the difficulty of flexible display. How to implement a flexible backlight has been an unsolved problem.
The direct type backlight module is directly arranged behind the liquid crystal display panel, has the advantage of a narrow frame, is widely applied to the field of large-size display, and faces the problem of thickness increase. A Mini light emitting diode (Mini-LED) is a small LED having a size of about 100 μm, and when the Mini-LED is applied to a backlight unit, it is possible to reduce the increase in thickness of a liquid crystal display device while realizing a narrow bezel. Similar to the conventional side-in backlight module, the vertical backlight module using Mini-LEDs also needs to use a brightness enhancement film, a reflector plate, etc. to improve the front brightness. The basic principle of the most commonly used brightness enhancement film is that part of the light with large angle can be converged to the central region, and the rest of the light can re-enter the light guide plate through total reflection and be recycled. Different from a light guide plate light returning system of a side-in type backlight, a vertical backlight module of a Mini-LED is designed without a light guide plate, but light returning is carried out by coating white light reflecting ink (namely white oil) on a driving substrate, and due to the reflection characteristic of the white oil, the reflected light and incident light generally have the same angle, or the reflected light enters a brightness enhancement film again after being reflected and is totally reflected back, or the reflected light is reflected to a low reflection area (such as the surface of the Mini-LED and a spacer area between the Mini-LED and the white oil) of the driving substrate and is lost, so that the whole light returning efficiency is greatly lost, and the light emitting efficiency is not high. The flexible Mini-LED backlight technology is difficult to implement, is disjointed from the traditional backlight technology on the one hand, and has high manufacturing cost and low yield on the other hand.
Disclosure of Invention
The invention mainly solves the technical problem of providing a direct type backlight device for improving the uniform light emission of a surface light source, and the utilization efficiency of light is improved.
In order to solve the technical problems, the invention adopts a technical scheme that an optical film group, a composite diffusion film and LED lamps which are arranged in a matrix form are provided from top to bottom of a direct type backlight device. The composite diffusion film includes a first diffusion film and a second optical film thereunder. The second optical film and the first diffusion film form a plurality of hollow convex parts, and the LED lamp at least corresponds to one convex part.
According to the direct type backlight module, the second optical film, the first diffusion film and the protruding parts are arranged, so that the light emitting uniformity of a surface light source and the utilization efficiency of light energy are improved. Although the light emitted from each LED light source has a high concentration, the diffusion angle can be increased by diffusion propagation of reflection or scattering to the convex portion, and the problem of uneven brightness (Mura) can be overcome, thereby realizing uniform light emission from the surface light source. In addition, the whole display device is simpler in production, assembly process and structure, and high in structural stability.
In a preferred embodiment, the protrusion is in a shape of a sawtooth, a semicircle or a circular arc, and the protrusion is disposed opposite to the top of the LED lamp.
In a preferred embodiment, the second optical film is a diffuser film.
In a preferred embodiment, the convex part is provided with a light scattering structure, and the light scattering structure comprises diffusion particles.
In a preferred embodiment, adjacent said projections are in optical communication.
In a preferred embodiment, the second optical film is integrally formed with the first diffuser film.
In a preferred embodiment, a transparent support structure is disposed between the second optical film and the first diffuser film.
In a preferred embodiment, the hollow structure of the protrusion is filled with at least one of light scattering particles, phosphor, and quantum dots.
In a preferred embodiment, the plurality of LED lamps includes at least one red LED chip, at least one blue LED chip, and at least one green LED chip.
In a preferred embodiment, the optical film group includes a diffusion film, a structural film, and a prism sheet. The prism sheet is arranged above the diffusion film.
Drawings
The invention and its advantages will be better understood by studying the following detailed description of specific embodiments, given by way of non-limiting example, and illustrated in the accompanying drawings, in which:
fig. 1 is an exploded view of a direct type backlight device according to embodiment 1 of the present invention.
Fig. 2 is a perspective view of a composite diffusion film of a direct type backlight device according to embodiment 1 of the present invention.
Fig. 3 is a sectional structure view of a direct type backlight device of embodiment 1 of the present invention to show a general optical principle thereof.
Detailed Description
Referring to the drawings, wherein like reference numbers refer to like elements throughout, the principles of the present invention are illustrated in an appropriate environment. The following description is based on illustrated embodiments of the invention and should not be taken as limiting the invention with regard to other embodiments that are not detailed herein.
The word "embodiment" is used herein to mean serving as an example, instance, or illustration. In addition, the articles "a" and "an" as used in this specification and the appended claims may generally be construed to mean "one or more" unless specified otherwise or clear from context to be directed to a singular form.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Further, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise direct contact of the first and second features through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Example 1
First, a direct type backlight device according to embodiment 1 of the present invention will be described with reference to fig. 1 to 3. The invention adopts a technical scheme that an optical film group 101, a composite diffusion film 102 and LED lamps 103 which are arranged in a matrix form are provided from top to bottom in a direct type backlight device. The composite diffuser film 102 includes a first diffuser film 201 and a second optical film 202 thereunder. The second optical film 202 and the first diffusion film 201 form a plurality of hollow protrusions, and the LED lamp corresponds to at least one of the protrusions.
According to the direct type backlight module, the second optical film 202, the first diffusion film 201 and the protruding parts are arranged, so that the light-emitting uniformity of a surface light source and the utilization efficiency of light energy are improved. Although the light emitted from each LED light source has a high concentration, the diffusion angle can be increased by diffusion propagation of reflection or scattering to the convex portion, and the problem of uneven brightness (Mura) can be overcome, thereby realizing uniform light emission from the surface light source. In addition, the whole display device is simpler in production, assembly process and structure, and high in structural stability.
The convex part is hemispherical, and the convex part and the top of the LED lamp are arranged in a one-to-one correspondence manner.
The convex portion of the second optical film 202 is provided with a light diffusion structure, and the light diffusion structure includes diffusion particles.
Adjacent ones of the lobes are in optical communication. The second optical film 202 is integrally formed with the first diffusion film 201.
A transparent support structure is disposed between the second optical film 202 and the first diffuser film 201.
The optical membrane group comprises a structural membrane, a prism sheet and a diffusion membrane which are sequentially arranged from top to bottom.
The plurality of LED lamps include red LED chips, blue LED chips and green LED chips.
Example 2
Only the differences between embodiment 2 and embodiment 1 will be described below, and the descriptions of the similarities will be omitted.
The hollow structure of the convex part is filled with light scattering particles and quantum dots. The first diffusion film 201 is a diffusion film.
While the invention has been described above with reference to certain embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the various embodiments of the present disclosure may be used in any combination, provided that there is no structural conflict, and the combination is not exhaustively described in this specification for brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A direct type backlight device, comprising:
the LED lamp comprises an optical film group, a composite diffusion film and LED lamps arranged in a matrix form, wherein the optical film group and the composite diffusion film are arranged from top to bottom;
wherein the composite diffusion film comprises a first diffusion film and a second optical film thereunder;
the second optical film and the first diffusion film form a plurality of hollow convex parts, and the LED lamp at least corresponds to one convex part.
2. The direct type backlight device according to claim 1, wherein the protrusions are saw-toothed, semicircular or arc-shaped, and the protrusions are disposed opposite to the tops of the LED lamps.
3. A direct type backlight device according to claim 2, wherein the second optical film is a diffusion film.
4. A direct type backlight device according to claim 2, wherein the protrusions are provided with light scattering structures comprising diffusing particles.
5. A direct type backlight device according to claim 4, wherein adjacent ones of the protrusions are in optical communication.
6. A direct type backlight device according to claim 5, wherein the second optical film is integrally formed with the first diffusion film.
7. A direct type backlight device according to claim 6, wherein a transparent support structure is disposed between the second optical film and the first diffusion film.
8. The direct type backlight device according to claim 1, wherein the hollow structure of the protrusion part is filled with at least one of light scattering particles, phosphor and quantum dots.
9. The direct type backlight device according to claim 1, wherein the plurality of LED lamps comprises at least one red LED chip, at least one blue LED chip and at least one green LED chip.
10. A direct type backlight device according to claim 1, wherein the optical film group comprises a diffusion film, a structural film and a prism sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010391481.9A CN111679491A (en) | 2020-05-11 | 2020-05-11 | Direct type backlight device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010391481.9A CN111679491A (en) | 2020-05-11 | 2020-05-11 | Direct type backlight device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111679491A true CN111679491A (en) | 2020-09-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010391481.9A Pending CN111679491A (en) | 2020-05-11 | 2020-05-11 | Direct type backlight device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111679491A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325901A (en) * | 2022-01-05 | 2022-04-12 | 张家港康得新光电材料有限公司 | A kind of spectroscopic film, its preparation method and system |
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| CN2916696Y (en) * | 2006-05-12 | 2007-06-27 | 长兴化学工业股份有限公司 | Direct Type Backlight Module |
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| CN103244872A (en) * | 2013-05-10 | 2013-08-14 | 晶科电子（广州）有限公司 | Lens-free ultra-thin direct type backlight module |
| CN103345088A (en) * | 2013-07-04 | 2013-10-09 | 青岛海信电器股份有限公司 | Direct lighting liquid crystal module and liquid crystal display device |
| CN103542332A (en) * | 2013-10-28 | 2014-01-29 | 惠州Tcl移动通信有限公司 | Cellphone and edge-in backlight module |
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| CN104006334A (en) * | 2014-05-20 | 2014-08-27 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN108227299A (en) * | 2017-12-29 | 2018-06-29 | 宁波东辉光电科技有限公司 | A kind of downward back photo structure |
| CN109154742A (en) * | 2016-05-19 | 2019-01-04 | 夏普株式会社 | Back lighting device and the display device for having back lighting device |
| CN110596956A (en) * | 2019-10-09 | 2019-12-20 | 深圳市隆利科技股份有限公司 | Backlight device and display device |
-
2020
- 2020-05-11 CN CN202010391481.9A patent/CN111679491A/en active Pending
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| CN2916696Y (en) * | 2006-05-12 | 2007-06-27 | 长兴化学工业股份有限公司 | Direct Type Backlight Module |
| KR20120002267A (en) * | 2010-06-30 | 2012-01-05 | 엘지이노텍 주식회사 | Backlight Unit with Quantum Dots |
| US20120176771A1 (en) * | 2011-01-12 | 2012-07-12 | Syue-Min Li | Backlight Device for Liquid Crystal Display |
| CN102437276A (en) * | 2011-11-25 | 2012-05-02 | 四川新力光源有限公司 | A kind of LED device and manufacturing method thereof |
| CN103244872A (en) * | 2013-05-10 | 2013-08-14 | 晶科电子（广州）有限公司 | Lens-free ultra-thin direct type backlight module |
| CN103345088A (en) * | 2013-07-04 | 2013-10-09 | 青岛海信电器股份有限公司 | Direct lighting liquid crystal module and liquid crystal display device |
| CN103542332A (en) * | 2013-10-28 | 2014-01-29 | 惠州Tcl移动通信有限公司 | Cellphone and edge-in backlight module |
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| CN114325901A (en) * | 2022-01-05 | 2022-04-12 | 张家港康得新光电材料有限公司 | A kind of spectroscopic film, its preparation method and system |
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Application publication date: 20200918 |
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| RJ01 | Rejection of invention patent application after publication |